igt_kms: Remove support for drivers with <1 drm_plane

We've had support for universal planes since kernel version 3.15, so
there's not really a good reason to try supporting drivers that lack
plane support now. As well, the current has_universal_planes logic is
broken anyway as it makes the assumption that having display planes
always means we have both a primary plane and a cursor plane (this isn't
true on radeon/amdgpu and nouveau).

So, remove this, and just check for whether or not we have a cursor
plane.

Signed-off-by: Lyude <lyude@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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